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my connections (wan/internet and LAN) drop randomly. I get server timeout when attempt to load a webpage and my Windows Live messenger drops out of connection.

This has happened several times; when it does happen I try to access my router's webpage (http://192.168.2.15) and it won't load, so this isn't a specific wan/internet problem, its most likely Windows 7.

I am not using DHCP, I enter in the IP/subnetmask and default gateway manually. This is because the LAN is complicated (two internets/gateways, two routers). The setup is flawless. (All DHCP turned off, all computers on one router and the second router pluged into the main router as a slave) then just switch default gateway to switch internet provider.

No other computer has this problem. Windows 7 diagnostics / connection area doesn't show any disconnection when it happens.

What could this be?

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migrated from stackoverflow.com Jun 18 '11 at 23:52

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"LAN is complicated ... (the) setup is flawless" –  ta.speot.is Jun 18 '11 at 23:52
    
Have you tried another OS on the box? What's to say it's not a dud NIC? Why is it "likely Windows 7"? –  ta.speot.is Jun 18 '11 at 23:53
    
Have check the driver for the NIC? Did it just update to a new driver? If so try to roll it back to the last working driver, if not check for a update. –  N4TKD Jun 19 '11 at 1:50

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